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Efficient Dynamic Machine Tool Simulation with Included Damping and Linearized Friction Effects
(2020)Procedia CIRP ~ 53rd CIRP Conference on Manufacturing Systems 2020Friction is a nonlinear phenomenon being present between moving components. For the axis of a machine tool, frictional and control effects have a strong influence on the system’s dynamic behavior. Due to their nonlinearity, frictional effects are usually modeled using time consuming transient simulations. This paper presents an approach to efficiently linearize frictional effects for a given excitation based on the nonlinear behavior of ...Conference Paper -
Feedback Control Design Maximizing the Region of Attraction of Stochastic Systems Using Polynomial Chaos Expansion
(2020)IFAC-PapersOnLine ~ 21st IFAC World CongressA feedback control design is proposed for stochastic systems with finite second moment which aims at maximising the region of attraction of the equilibrium point. Polynomial Chaos (PC) expansions are employed to represent the stochastic closed loop system by a higher dimensional set of deterministic equations. By using the PC expanded system representation, the available information on the uncertainty affecting the system explicitly enters ...Conference Paper -
Contactless surface flattening of additive manufactured nickel-base alloy parts by ultra-short pulsed laser ablation
(2020)Procedia CIRP ~ 20th CIRP Conference on Electro Physical and Chemical MachiningNickel-base alloy samples produced by selective laser melting (SLM) exhibit high surface roughness of 14.2 μm ±4.8 μm standard deviation at the sidewalls. Ultra-short pulsed (USP) laser ablation at a pulse duration of 10 ps is applied to reduce the surface roughness. This flattening method does not require a melting phase. The influence of the tilt angle and the orientation of the SLM layers on the surface topography of the sample is ...Conference Paper -
If beam search is the answer, what was the question?
(2020)Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP)Conference Paper -
Analysis of WEDM Process with Respect to Wire Wear and Wire Consumption
(2020)Procedia CIRPWire electric discharge machining (WEDM) gains more and more in importance. Its unique advantages for instance processing material independently of their hardness, at high aspect ratios with good form accuracies and part precision make this process interesting for mould and die industry, aerospace, medical and many other applications. Naturally, the increasing demand requires more wire which plays a significant role in economical as well ...Conference Paper -
Development of Process Chain for Micro-Injection Molding
(2020)Procedia CIRP ~ 20th CIRP Conference on Electro Physical and Chemical MachiningIn today’s continuously growing demand for components with increasingly smaller dimensions and features, micro-manufacturing is gaining more significance. For the mass production of plastic components with micro-features, injection molding is particularly suitable and still customary in order to keep target costs. Due to high requirements regarding lifetime and resistance to wear, the molds are made of hardened steel. The shaping of these ...Conference Paper -
The Doctor Will See Yourself Now: Review and Discussion of a Mass-market Self-service Technology for Medical Advice
(2020)Proceedings of the 13th International Joint Conference on Biomedical Engineering Systems and TechnologiesLeveraging new technological tools in medical service delivery has been shown as important factor adding scalability and/or value to patient care. However, as of yet, relatively little research has focused on the implementation of mass-market digital health products to address population needs. The current paper examines one such tool; a browser-optimized smartphone app developed by a major Swiss health insurance, offering validated medical ...Conference Paper -
Turning: Autonomous process set-up through Bayesian optimization and Gaussian process models
(2020)Procedia CRIPIn turning, process parameters such as feed rate and cutting speed are normally selected by an operator and adapted depending on the process requirements. In this study, autonomous process set-up of the turning process is investigated based on Bayesian optimization and Gaussian process models. Unconstrained Bayesian optimization is compared to an implementation with added constraint with simulated machining parameters. It is shown that ...Conference Paper -
Dynamic Detectors of Oriented Spatial Contrast from Isotropic Fixational Eye Movements
(2020)Proceedings of the 15th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2020)Good vision proficiency and a complex set of eye movements are frequently coexisting. Even during fixation, our eyes keep moving in microscopic and erratic fashion, thus avoiding stationary scenes from fading perceptually by preventing retinal adaptation. We artificially replicate the functionalities of biological vision by exploiting this active strategy with an event-based camera. The resulting neuromorphic active system redistributes ...Conference Paper -
Eye Gaze Tracking for Detecting Non-verbal Communication in Meeting Environments
(2020)Proceedings of the 15th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and ApplicationsNon-verbal communication in a team meeting is important to understand the essence of the conversation. Among other gestures, eye gaze shows the focus of interest on a common workspace and can also be used for an interpersonal synchronisation. If this non-verbal information is missing and or cannot be perceived by blind and visually impaired people (BVIP), they would lack important information to get fully immersed in the meeting and may ...Conference Paper